Thermostat for MerCruiser Stern Drive 2.0L Engines, 115–170 HP, 181°F (83°C) – Replaces 879150054
Thermostat for MerCruiser Stern Drive 2.0L Engines, 115–170 HP, 181°F (83°C) – Replaces 879150054 is backordered and will ship as soon as it is back in stock.
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Thermostat for MerCruiser Stern Drive 2.0L Engines, 115–170 HP, 181...
Thermostat for MerCruiser Stern Drive 2.0L Engines, 115–170 HP, 181°F (83°C) – Replaces 879150054 is backordered and will ship as soon as it is back in stock.
Product Details
This replacement thermostat is intended for MerCruiser stern-drive applications using 2.0L engines rated from 115 to 170 HP. It is specified for an operating temperature of 181°F (83°C).
The thermostat replaces or cross-references manufacturer part number 879150054. Confirm the application and part number against your engine and original thermostat before ordering.
- Replacement thermostat for MerCruiser stern-drive applications.
- For 2.0L engines rated 115–170 HP.
- 181°F (83°C) temperature specification.
- Sold as an individual thermostat, not a multi-part kit.
Part Number Matrix
Use the following reference to compare the thermostat with the corresponding manufacturer number.
| Reference Type | Part Number |
|---|---|
| MerCruiser manufacturer reference | 879150054 |
Engine & Model Compatibility
The company fitment information identifies this thermostat for MerCruiser stern-drive 2.0L engines rated from 115 to 170 HP. The available information does not establish a complete model-year, serial-number, or individual engine-model list.
Always compare the original thermostat, manufacturer part number, engine configuration, and service-manual requirements before installation. Horsepower range alone may not confirm fitment for every engine variant.
| Brand / Application | Engine Displacement | Rated Horsepower | Application Type | Temperature | Reference Part No. |
|---|---|---|---|---|---|
| MerCruiser | 2.0L | 115–170 HP | Stern drive / outdrive | 181°F (83°C) | 879150054 |
Technical Specs
- Product Type
- Thermostat
- Application
- MerCruiser stern drive / outdrive
- Engine Displacement
- 2.0L
- Rated Horsepower
- 115–170 HP
- Temperature Specification
- 181°F (83°C)
- Manufacturer Reference
- 879150054
What’s in the Box
- Thermostat
This listing is for the individual thermostat. A housing gasket, seal, fasteners, or other installation components are not identified as included.
Installation Notes
- Allow the engine to cool completely before beginning work.
- Disconnect the battery and follow the safety procedures in the engine service manual.
- Locate the thermostat housing and place a suitable container beneath the area before opening the cooling system.
- Drain coolant as required to prevent spillage when the housing is opened.
- Remove the housing cover carefully and note the orientation of the existing thermostat.
- Clean the mating surfaces and inspect the housing, sealing surfaces, and related components for damage or corrosion.
- Install the replacement thermostat in the orientation specified by the engine service manual.
- Replace the housing gasket or seal if required; a gasket is not identified as included with this thermostat.
- Reinstall the housing and tighten fasteners to the manufacturer's specified torque.
- Refill and bleed the cooling system according to the service procedure, then run the engine and check operating temperature and coolant leaks.
Troubleshooting & FAQ
What engines is this thermostat intended for?
The listed application is MerCruiser stern-drive or outdrive 2.0L engines rated from 115 to 170 HP. Confirm the exact engine model, serial range, and original part number before installation.
What temperature is this thermostat?
The specified temperature is 181°F (83°C).
What part number does this thermostat replace?
This thermostat is listed as a replacement for manufacturer part number 879150054.
Is this a complete thermostat kit?
No. The company product record identifies this product as an individual thermostat rather than a multi-part kit. A gasket, seal, housing, or other installation hardware is not identified as included.
How can I confirm fitment?
Compare the number on your original thermostat with 879150054 and verify the 2.0L, 115–170 HP stern-drive application. If the model-year or serial-number information differs, consult the engine service manual or a qualified marine technician.
What are common signs of thermostat problems?
Possible symptoms include overheating, failure to reach normal operating temperature, unstable temperature readings, or cooling-system problems. Diagnose the complete cooling system before replacing the thermostat.
Safety & Important Info
- Work only on a completely cool engine and follow the manufacturer's service procedures.
- Verify the engine model, serial range, displacement, horsepower, and manufacturer reference number before purchase.
- Do not assume that a 2.0L engine or horsepower rating alone confirms fitment.
- Professional installation is recommended when the cooling system or engine service procedure is unfamiliar.
About Sea Sierra
- Marine Parts Support — We supply replacement components for marine service and repair applications.
- Application-Focused Listings — Product references and fitment information are provided to help customers compare parts before ordering.
- Customer Assistance — If you need help confirming an application, provide your engine model, serial information, and original part number.
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